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Microsoft founder Bill Gates is seen at the EU Commission headquarters in Brussels, in this file photo taken January 22, 2015. Gates stands atop Forbes magazine's annual list of the world's richest people, as Facebook Inc's Mark Zuckerberg joined the top 20 and basketball star Michael Jordan plowed new air by making the list for the first time. REUTERS/Francois Lenoir/Files (BELGIUM - Tags: BUSINESS MEDIA)